Display panel driving circuit, display panel, and driving method thereof

Abstract

By following properties that there is coupled noise, which is coupled from a display panel, within at least one common voltage used on the display panel, the at least one common voltage is fed-back into a pixel electrode driving module, and driving voltages are generated accordingly, so that the generated driving voltages carry noises closes to coupled noises of the display panel. As a result, while the driving voltages carrying noises from the at least one common voltage, the pixel electrode driving module is capable of driving a corresponding pixel electrode with a stable voltage difference, and thereby capable of relieving horizontal crosstalk and raising a display quality of the display panel.

What is claimed is: 
     
       1. A display panel driving circuit, comprising:
 a plurality of pixel electrode driving modules connected in series, each of the pixel electrode driving modules comprising a resistor connected to another resistor of an adjacent pixel electrode driving module in series for outputting a plurality of different driving voltages to corresponding pixel electrodes according to a voltage source for required power, and a regulating capacitor for regulating the corresponding driving voltage with a charged and fixed voltage difference; and 
 a voltage feedback module coupled to one of the plurality of pixel electrode driving module for providing the coupled pixel electrode driving module with at least one feedback voltage, wherein the at least one feedback voltage is a common voltage used by a display panel as a required common voltage level while a transistor array of the display panel stores voltages; 
 wherein each of the pixel electrode driving module is capable of driving the corresponding pixel electrode according to the corresponding driving voltage referring to the at least one feedback voltage, so that a difference of voltage level between ripples of the corresponding driving voltage and the at least one feedback voltage is close to a constant; 
 wherein the regulating capacitor has a first terminal directly coupled to the voltage feedback module for receiving the at least one feedback voltage, and a second terminal directly coupled to a first terminal of the resistor. 
 
     
     
       2. The display panel driving circuit of  claim 1 ,
 wherein the voltage feedback module comprises:
 a first switch having a first terminal coupled to one of the plurality of pixel electrode driving modules, and having a second terminal coupled to ground; and 
 a second switch having a first terminal coupled to the first terminal of the first switch, and having a second terminal coupled to a display region of the display panel for receiving a first feedback voltage of the at least one feedback voltage. 
 
 
     
     
       3. The display panel driving circuit of  claim 1 ,
 wherein the second terminal of the regulating capacitor is coupled to a pixel electrode driven by each of the plurality of pixel electrode driving modules. 
 
     
     
       4. The display panel driving circuit of  claim 1 ,
 wherein the display panel driving circuit further comprises:
 a voltage difference resistor having a first terminal coupled to one of the pixel electrode driving modules, and having a second terminal coupled to ground. 
 
 
     
     
       5. The display panel driving circuit of  claim 1  further comprising:
 a voltage amplifying module coupled to the voltage feedback module for receiving the at least one feedback voltage, the voltage amplifying module amplifying a voltage difference between a common voltage level and one of the at least one feedback voltage for generating an amplified feedback voltage, and the voltage amplifying module being coupled to each of the plurality of pixel electrode driving modules for transmitting the amplifying feedback voltage to each of the plurality of pixel electrode driving module; 
 wherein each of the plurality of pixel electrode driving module is capable of driving the corresponding pixel electrode according to a driving voltage referring to the amplified feedback voltage. 
 
     
     
       6. The display panel driving circuit of  claim 5 ,
 wherein the second terminal of the regulating capacitor is coupled to a pixel electrode driven by each of the pixel electrode driving circuits. 
 
     
     
       7. The display panel driving circuit of  claim 5 ,
 wherein the display panel driving circuit further comprises:
 a voltage difference resistor having a first terminal coupled to one of the plurality of pixel electrode driving module, and having a second terminal coupled to ground. 
 
 
     
     
       8. The display panel driving circuit of  claim 5  further comprising:
 a buffering module coupled to the voltage amplifying module for buffering the common voltage level. 
 
     
     
       9. The display panel driving circuit of  claim 8 ,
 wherein the buffering module comprises:
 a first operational amplifier having a positive input terminal coupled to the common voltage level, and having a negative input terminal coupled to an output terminal of the first operational amplifier; 
 
 wherein the voltage amplifying module comprises:
 a second operational amplifier having an output terminal coupled to each of the plurality of pixel electrode driving module for outputting the amplifying feedback voltage, and having a positive input terminal coupled to the voltage feedback module for receiving the at least one feedback voltage. 
 
 
     
     
       10. The display panel driving circuit of  claim 9 ,
 wherein the voltage amplifying module further comprises:
 a first resistor having a first terminal coupled to the positive input terminal of the second operational amplifier, and having a second terminal coupled to the output terminal of the first operational amplifier; 
 a second resistor having a first terminal coupled a negative input terminal of the second operational amplifier, and having a second terminal coupled to the second terminal of the first resistor; 
 a third resistor having a first terminal coupled to the negative input terminal, and having a second terminal coupled to the output terminal of the second operational amplifier; and 
 a filtering capacitor having a first terminal coupled to the positive input terminal of the second operational amplifier, and having a second terminal coupled to ground. 
 
 
     
     
       11. The display panel driving circuit of  claim 5 ,
 wherein the common voltage level indicates a reference level of a driving voltage difference of a pixel electrode, and a voltage difference between a driving voltage of a single pixel electrode and the common voltage level indicates a practically-used voltage difference in driving the pixel electrode. 
 
     
     
       12. A driving method, comprising:
 providing the display panel driving circuit of  claim 1 ; 
 providing the at least one feedback voltage to one of the plurality of pixel electrode driving modules connected in series, wherein the at least one feedback voltage is the common voltage coupled with the first noise and used by the display panel as the required common voltage level while the transistor array of the display panel stores voltages; and 
 driving the corresponding pixel electrode according to the corresponding driving voltage coupled with the second noise referring to one of the at least one provided feedback voltage; 
 wherein the first noise and the second noise are synchronized and have the same amplitude. 
 
     
     
       13. The driving method of  claim 12  further comprising:
 amplifying a voltage difference between a common voltage level and one of the at least one feedback voltages for generating an amplified feedback voltage; and 
 wherein the driving step includes driving the corresponding pixel electrode according to the driving voltage referring to the amplified feedback voltage. 
 
     
     
       14. The driving method of  claim 13  further comprising:
 buffering the common voltage level. 
 
     
     
       15. The driving method of  claim 14 ,
 wherein the common voltage level indicates a reference voltage of a driving voltage difference of a pixel electrode, and a voltage difference between a driving voltage of a single pixel electrode and the common voltage level indicates a used voltage difference for driving the pixel electrode. 
 
     
     
       16. A display panel, comprising:
 a panel; and 
 a display panel driving circuit, comprising:
 a plurality of pixel electrode driving modules connected in series, each of the pixel electrode driving modules comprising a resistor connected to another resistor of an adjacent pixel electrode driving module in series for outputting a plurality of different driving voltages to corresponding pixel electrodes according to a voltage source for required power, and a regulating capacitor for regulating the corresponding driving voltage with a charged and fixed voltage difference; and 
 a voltage feedback module coupled to one of the plurality of pixel electrode driving module for providing the coupled pixel electrode driving module with at least one feedback voltage, wherein the at least one feedback voltage is a common voltage used by a display panel as a required common voltage level while a transistor array of the display panel stores voltages; 
 
 wherein each of the pixel electrode driving module is capable of driving the corresponding pixel electrode according to the corresponding driving voltage referring to the at least one feedback voltage, so that a difference of voltage level between ripples of the corresponding driving voltage and the at least one feedback voltage is close to a constant; 
 wherein the regulating capacitor has a first terminal directly coupled to the voltage feedback module for receiving the at least one feedback voltage, and a second terminal directly coupled to a first terminal of the resistor. 
 
     
     
       17. The display panel of  claim 16 ,
 wherein the voltage feedback module comprises:
 a first switch having a first terminal coupled to one of the plurality of pixel electrode driving modules, and having a second terminal coupled to ground; and 
 a second switch having a first terminal coupled to the first terminal of the first switch, and having a second terminal coupled to a display region of the panel for receiving a first feedback voltage of the at least one feedback voltage. 
 
 
     
     
       18. The display panel of  claim 16 ,
 wherein the second terminal of the regulating capacitor is coupled to a pixel electrode driven by each of the plurality of pixel electrode driving modules. 
 
     
     
       19. The display panel of  claim 16 ,
 wherein the display panel driving circuit further comprises:
 a voltage difference resistor having a first terminal coupled to the pixel electrode driving module, and having a second terminal coupled to ground. 
 
 
     
     
       20. The display panel of  claim 16  further comprising:
 a voltage amplifying module coupled to the voltage feedback module for receiving the at least one feedback voltage, the voltage amplifying module amplifying a voltage difference between a common voltage level and one of the at least one feedback voltage for generating an amplified feedback voltage, and the voltage amplifying module being coupled to one of the plurality of pixel electrode driving modules for transmitting the amplifying feedback voltage to one of the plurality of pixel electrode driving module; 
 wherein each of the plurality of pixel electrode driving module is capable of driving the corresponding pixel electrode according to a driving voltage referring to the amplified feedback voltage. 
 
     
     
       21. The display panel of  claim 20 ,
 wherein the second terminal of the regulating capacitor is coupled to a pixel electrode driven by each of the pixel electrode driving circuits. 
 
     
     
       22. The display panel of  claim 20 ,
 wherein the display panel driving circuit further comprises:
 a voltage difference resistor having a first terminal coupled to one of the plurality of pixel electrode driving module, and having a second terminal coupled to ground. 
 
 
     
     
       23. The display panel of  claim 20  further comprising:
 a buffering module coupled to the voltage amplifying module for buffering the common voltage level. 
 
     
     
       24. The display panel of  claim 23 ,
 wherein the buffering module comprises:
 a first operational amplifier having a positive input terminal coupled to the common voltage level, and having a negative input terminal coupled to an output terminal of the first operational amplifier; 
 
 wherein the voltage amplifying module comprises:
 a second operational amplifier having an output terminal coupled to each of the plurality of pixel electrode driving module for outputting the amplifying feedback voltage, and having a positive input terminal coupled to the voltage feedback module for receiving the at least one feedback voltage. 
 
 
     
     
       25. The display panel of  claim 24 ,
 wherein the voltage amplifying module further comprises:
 a first resistor having a first terminal coupled to the positive input terminal of the second operational amplifier, and having a second terminal coupled to the output terminal of the first operational amplifier; 
 a second resistor having a first terminal coupled a negative input terminal of the second operational amplifier, and having a second terminal coupled to the second terminal of the first resistor; 
 a third resistor having a first terminal coupled to the negative input terminal, and having a second terminal coupled to the output terminal of the second operational amplifier; and 
 a filtering capacitor having a first terminal coupled to the positive input terminal of the second operational amplifier, and having a second terminal coupled to ground.